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April 2, 1963 J. B. BLYDENBURGH 3,083,464 SURVEYOR’S TRANSIT THEODOLITE CHAINING ATTACHMENT Filed Feb. 12. 1960 He. 4 2 Sheets-Sheet 1 April 2, 1963 J. B. BLYD'ENBURGH 3,083,454 SURVEYOR’S TRANSIT THEODOLITE CHAINING ATTACHMENT Filed Feb. 12, 1960 2 Sheets-Sheet 2 mu w:m: 92 _ ._ m6 me Q m.0 United States Patent 0 1 3,083,464 .SURVEYGR’S TRANSIT THEUDOLITE CHAINING ATTACHMENT John B. Blydenburgh, 727 Fort Salonga Road, Northport, N.Y. Filed Feb. 12, 1960, Ser. No. 8,422 6 Claims. (Cl. 33-1) 3,083,464 Patented Apr. 2, 1963 2 the chain with either as it maybe viewed from either of the two lines 7--7 therein; and FIG. 8 is an enlarged side elevational view of a modi ?ed form of the attachment of the present invention. Referring to the drawings, in which like numerals iden tify similar parts throughout, it will be seen from FIGS. 1 to 4 incl. that an embodiment of the present invention, indicated at 10, may comprise an elongated frame means The present invention relates to .surveyor’s transit 11, translating screw means 12 and a traveler 13. The theodolites (hereinafter called “transit” or “gun” in ac 10 frame means 11 preferably includes an elongated frame cordance with conventional surveying practice) and plate 14 having a longitudinally-extending ?at side or ver means thereof to facilitate chaining a line or the distance tical face 15 and provided at its opposite ends with a between two remote stations. pair of support arms 16 and 17 extending angular-1y there A general object of the present invention is to pro from in longitudinally-spaced relation. Preferably the vide an attachment for a transit which is simple in con 15 support arms 16 and 17 extend laterallyoutward from struction and readily mounted thereto and provides a the side face 15 and substantially normal thereto, and ready means for compensating for differences between may be formed as integral end portions of the frame plate. successive transit set-ups between stations a plurality of chains apart and the actual distances between these set The translating screw means 12 is rotatably supported up points, and which facilitates in an e?icient and simple 20 by the support arms 16 and 17 and, for this purpose, each manner other chain measurements effected with the use support arm may have a through bore ?tted with a sleeve of a transit equipped therewith. A more speci?c object of the invention is to provide such an attachment characterized by screw adjustable bearing 18 to provide a longitudinally-spaced pair there of, as is indicated in FIG. 4. The screw means 12 pref erably may be in the form of a shaft 19‘ having longitudi means for supporting a chaining tape along the optical 25 nally-spaced journal sections 20, 20 rotatably received axis of the transit telescope at points offset along this axis through the bearings 18, 18, and an externally-threaded from the axis of the telescope axle or shaft for ready section intervening these bearings and the support arms cumulative or direct determination of such offset dis tances. 16 and 17 in which the latter are mounted. The threads of the threaded section of screw shaft 19 may have a A further object of the invention is to provide struc pitch of the order of thirty-two threads per inch (32 tural embodiments of the device which are readily con th./in.), or any other pitch which one may prefer. Pref erably one end 21 of the screw shaft is headed to provide an annular shoulder 22 rotatably abutted to end face 23 of support arm 16. The other end 24 of screw shaft 19 structed and allow e?icient use and operation thereof. Other objects of the invention will in part be obvious and will in part appear hereinafter. The invention accordingly comprises the features of 35 projects appreciably beyond the end face 25 of support arm 17 and may be surrounded adjacent the latter with a construction, combinations of elements, and arrangements of parts, which will be exempli?ed in the constructions thrust washer 26. Upon the shaft end 24- is ?xed, such as hereinafter set forth, and the scope of the invention by a drift pin 27, a knurled hand knob 28 for manual will be indicated in the claims. manipulation or rotation of screw shaft 19. Thus, in the For a fuller understanding of the nature and objects 40 rotation of screw shaft 19 by the manual knob 28, longi of the invention reference should be had to the following tudinal movement thereof is prevented by the headed end detailed description taken in connection with the accom 21 and the thrust washer 26 and the knob. panying drawings, in which: The traveler 13 has thread following means engaged FIG. 1 is a side elevational view to approximate scale with the external threads of screw shaft 19 for transla of an embodiment of the attachment of the present in~ 45 tion longitudinally of the frame means 11 and, for this purpose, may be provided with an internally-threaded venticn, showing in dotted lines portions of a transit to through hole 29 through which is threadably engaged the which it is mounted for use; threaded section of the screw shaft 19. Means are pro FIG. 2 is an enlarged perspective view of the attach ment shown in FIG. 1, depicting in dotted lines parts 50 vided to permit the traveler 13 to slide along the frame plate 15 while preventing relative rotation, so as to cause of the transit and of a chain tape associated with the the traveler to be translated along the threaded section of the screw shaft 19 when the latter is rotated. For this purpose the traveler 13 may be in the form of a block 30 3——3 of1FIG. 1; having an inner vertical side face 31 juxtaposed closely to FIG. 4 is a top plan view of the attachment structure 55 or in sliding contact with the frame plate outside face 15. shown in FIGS. 1 and 3, depicting in dotted lines parts of The traveler block 30 also preferably has a ?at top face the transit telescope axle and one of the standards through ,32 provided with a transverse index mark 33‘ which, if which the latter is journaled; desired, may be in the form of a ?ne groove. FIG. 5 is a side elevational diagrammatic view of a Chain pillow means 34, to serve as a chain rest or pair of transits equipped with such attachments not de 60 cradle, is carried by the traveler ‘block 30' and may, if attachment; FIG. 3 is a sectional view taken substantially on line picted therein, illustrating use thereof in the chaining of desired, be made integral therewith to simplify manufac a line between remote stations A and B a plurality of .ture. The chain pillow means 34 in the FIGS. 1 to 4 incl. embodiment is in the form of an upwardly tapered chains apart; body having oppositely sloped, oblique side faces 35, 35 FIG. 6 is a side elevational view, with parts broken away and others indicated in dotted lines, of the pair 65 meeting in a lateral, transversely-extending apex edge 36. A chain, such as the conventional ?at tape type indicated transits illustrated in FIG. 5, depicting use thereof in the in dotted lines at 37 in FIG. 2, is to be rested upon the chaining of the distance from station A to the ?rst set-up pillow apex 36 for drag thereover. Since the top face point there succeeding; 32 in the structural embodiment illustrated in FIGS. 1 FIG. 7 is an enlarged plan view, with parts broken 70 to 4 incl. is to be aligned with the axis of the telescope away, of either of the two chaining attachments shown in axle to which this accessory or attachment is to he ?xedly FIG. 6, illustrating correct association of a portion of mounted, the apex 36 of the chain pillow 34 is located 3,088,464 3 4 substantially at the plane thereof, but preferably is offset or disposed below this top face a distance t, indicated in FIG. 3, which is the average thickness of such conven In order to facilitate adjustment of the traveler block 30 to the “0” position with its index mark 33 aligned with the telescope axle axis 46, the head 50 of screw 45 tional chain tapes, thereby permitting the top face of may, if desired, be provided with an axial drill hole or the tape at the pillow apex to be substantially aligned with the traveler block top face and index mark 33 on dimple 60, as is best seen in FIG. 2. Also, this align ment may be facilitated by the provision of a vertical mark or line 61 on the face 15 of frame plate 14 aligned the latter. ~ 7 with such drill hole 60. The accessory or attachment 10 of the present inven So that one may appreciate readily some of the ad tion is to be ?xedly mounted to one end of the conven tional telescope axle of a transit. The telescope of such 10 vantages attainable by use of the accessory or attach a transit is indicated in dotted lines at 38 in FIGS. 1 and ment 16 of the present invention, let it be assumed that it has been ?xedly mounted to one end of the telescope 3 which, as is suggested in FIG. 1 will include the usual back end eyepiece 39 and the front end 40. The tele axle of a transit in a suitable manner, such as is proposed in FIG. 3, and that two such transits have been so scope axle may, in conventional manner, be in the form of a pair of stub shafts 41 and 42, each rotatably sup 15 equipped with such device. In FIG. 5 is diagrammati cally illustrated the measuring of a line with the use of ported by a conventional standard structure 43, as is these two transits there identi?ed as “Gun #1” and “Gun indicated in dotted lines in FIG. 3. Since the accessory #2.” The distance between remote station A and sta 10 is to be ?xedly mounted upon the telescope axle, the tion B is to be measured and this distance, for example, stub shaft 42 may, for this purpose, be provided with an ' internally-threaded hole 44 adapted threadably to receive 20 may be two plus (2+) chains. Thus, instead of trans ferring the positions of the ends of the chain tape to the the externally-threaded shank of a screw 45 which will have its axis substantially aligned with the axle axis 46. ground by means of plumb bobs or to previously placed stakes by actual contact, the positions of set-ups are trans The outer end 47 of stub shaft 42 may be in the form of ferred directly to the accessories or attachments with a ?at face against which is abutted a washer 48 arranged about the shank of screw 45 and in turn against which 25 which the two transits have been equipped. Advan— the inside vertical face 49 of frame plate 14 is abutted. tageously the transits, while being of conventional con struction, should be mounted on low tripods so that the Screw 45 has an enlarged head 50 which is seated in a horizontal axles thereof will be at convenient working counter-sunk recess 51 in the outside face 15 of vertical heights, such as about waist-high or slightly lower. Pref frame plate 14 with the screw shank extending through a hole 52 in this plate. By such means the accessory frame 30 erably, each accessory or attachment 10 is mounted to the right side of the telescope of each transit and the means 11 is securely mounted to the outer end 47 of the note keeping and subsequent calculations are simpli?ed if axle stub shaft 42. This mount of the accessory 19 is the dimensions of the horizontal axles of the two transits to be of a ?xed nature so that the accessory will rotate are the same. The adjustment of the vertical circle of with the telescope axle. This ?xed relationship may be attained by the employment of a drift pin 53v extended 35 each transit is important. Also, in the method of meas through aligned holes in the frame plate 14, the thrust urement practiced with such accessory-equipped transits, washer 48 and into the outer end of axle stub shaft 42, as is indicated in FIG. 3. Any desired equivalent means the chain tape, which may be of conventional length, e.g., one hundred feet (100’), two hundred feet (200") or ?fty meters (50 m.), is supported only at each end, and may be employed ?xedly to mount such frame means to ' - an end of telescope shaft structure in practice of the in 40 thus the control of the tension applied thereto as it is stretched from the accessory on one transit to the acces vention, either by the transit manufacturer or by one who sory on the other transit is important. Measurements re possesses a conventional transit to'which he may wish to quiring an extreme degree of accuracy dictate consider > ' _ ation of the change in the straight line distance between This ?xed mount of the accessory 10 to one end of the telescope axle is to be such that the index mark 33 on the 45 the reference marks on the end sections of the chain tape, such as “0” and “100,” as the vertical angle changes from top face 32 of the traveler block 30 will be aligned with the horizontal. the telescope axle axis 46 in the “0” position of the In measuring the line from the station A to the station traveler block, as maybe understood from FIG. 3. Also, B, one transit (Gun #1) is carefully set up over the start when the accessory 10 is ?xedly mounted in this manner, or by any other suitable means, to the end of the tele 50 ing point at station A and the telescope 38 thereof is sighted on station B. The chain tape is then stretched scope axle it is also intended that when the traveler block toward station B and a point is set on the line at the ?rst 130 is translated longitudinally of the frame means 11, i.e., add such accessory. chain length in the vicinity of temporary intervening sta tion X. In setting this point, the chain tape should be parallel relation to the optical axis of the telescope, indi 55 held at a convenient working height and since this is only along the vertical outside face 15 of the frame plate 14, the top face 32 of the traveler block is to move along in cated at 54 in FIGS. 1 and 3. Thus, the pillow apex 36 which is offset laterally to one side of the telescope optical a temporary point, it will be sufficiently accurate if it is set within about four hundredths of a foot (0.04’) of the true chain length. The second transit (Gun #2) is now set up solidly over the temporary point at temporary in allel to this telescope axis in a plane which is located at the small distance t below a plane having as line elements 60 tervening station X, leveled up and sighted back upon the intersection of the telescope 38 and its horizontal axle the intersecting telescope axle axis 46 and the telescope axis 54 will be translated along a path substantially par- _ optical axis 54. > In order'to eliminate backlash between, the threads of the threaded section of screw shaft 19 and the internal threads of the hole 29 through the traveler block 30, spring means may be interposed between the traveler block and one of the support arms 16 and 17, and, if de sired, such spring means may be located on opposite sides of the traveler ‘block but one such biasing spring device of transit (Gun #1) ‘at station A, making certain that all clamps are secure. This back sighting of the second transit (Gun #2) at X is indicated in FIG. 5 by the orientation of the dotted line showing thereat of telescope 138, its front end 140 and its eyepiece 139. The vertical angle and the temperature at the second transit (Gun #2) are now observed and recorded. The telescope 38 of the transit (Gun #1) at station A is now sighted on the in will serve the purpose. Such spring means may be in the 70 tersection of the telescope 138 and its horizontal axle of the transit (Gun #2) at temporary intermediate station formof a helical compression spring 55 having one ‘end X. After making certain that all clamps of transit (Gun 56 .abutted against the inner face 57 of support arm 16 #1) are secure, the vertical angle and temperature at sta and its other end 58 abutted against the opposite face ‘59 tion A are also observed and recorded. As a result, the of the traveler block 30, with the turns thereof arranged about screw shaft 19. ‘ 75 set up depicted in FIG. 6 is attained. 5 3,083,464 With the telescope 38 of the ?rst transit (Gun #1) at station A sighting forward and the telescope ‘138 of the second transit (Gun #2) at intervening temporary station X sighted back, it will be seen from FIG. 6 that the ac 6 sighting back along the line in the same direction, the accessories or attachments 10, 10 will be on the same far sides of the transit telescopes, as viewed in FIG. 5. Thus, the measurement with the chain tape will be effected cessory or attachment 10 mounted on the ?rst transit at along the same side of the line without cross over and station A is on the near side as viewed in FIG. 6, but that this accessory or attachment mounted on the second transit at station X is on the far side of telescope 138. no compensating calculation is required, it being remem bered that the transit at station X was changed in no way after the ?rst chaining measurement. This second chain Thus, the telescope 138 has been shown in dotted lines length measurement will thus be made from a point in FIG. 6 in order more clearly to see the accessory or 10 exactly one full chain length forward of station A since attachment 10 associated therewith, the back face 49 of the pillow apex 36 at station X had been moved forward the frame plate =14 thereof being nearest the observer. the distance d and will now be used for alignment there The chain tape 37 is now brought into position for ac with of the “0” on the back end portion 62 of the tape curate measurement of the distance between the stations 37 as the latter is pulled forward to temporary interven A and X. It may be desirable to stretch the chain tape 15 ing station Y. Let it be assumed that temporary inter 37 from station A to station X on the same side of the vening stations X and Y are a distance apart slightly two transits (Gun #1 and Gun #2) by locating the “0” greater than one full chain length, thus plus distance be reference mark at the rear end of the tape opposite the ing d’. The knob 28 of the accessory or attachment 10 usual drill hole on the center of the end of the left side on the ?rst transit (Gun #1) which is now set up attem we stub shaft of the transit at station A and slidably rest porary intervening station Y will be manipulated to back ing the front end of the tape on the pillow apex of the at up its traveler block 30 until the pillow apex 36 carried tachment 19 mounted on the transit at station X and thereby is aligned with the forward reference mark “*100” pulling the tape to the desired tautness thereover. How on the front end portion '64 of the tape. Thus, while ever, since it is proper to cross the tape over from one the transit at temporary intervening station Y (Gun #1) side of the line to the other in effecting such a measure 25 has been located forward from station A a distance equal ment, the compensating calculation to accommodate this angular relationship being readily made, such stretching of the tape is illustrated in FIG. 6 for clarity of illustra tion and ready understanding. to the sum of one chain length minus the distance d, and another full chain length plus the distance d’, these variations need not be taken into consideration in the taking of notes since the pillow apex 36 on the transit As is indicated in FIG. 6, the rear end 62 of the chain 30 (Gun #1) at temporary intervening station Y has been tape 37 will be rested over the apex 36 of the pillow 34 adjusted to be exactly two chain lengths forward of sta of the attachment 19 at station A and held ?rmly with tion A by this chaining procedure. The next and ?nal its reference mark “0,” indicated at 63 in FIG. 7, aligned steps of measuring the line between stations A and B is with pillow apex 36 and the mark 61 on the face 15 of then performed as follows. frame plate 14. The tape front end 64 will be rested 35 When the pillow apex 36 of the accessory or attachment upon the pillow apex 36 of the other accessory or attach 1% on the transit (Gun #1) at temporary intervening ment 11% mounted on the transit at station X and pulled station Y has now been adjusted to be exactly two chain forward thereover to suitable tautness. The instrument lengths forward from station A, the clamps of the transit man operating the transit at station X will then reach (Gun #2), which is now the rear one at station X, can forward along the side of the telescope 138 and manipu 40 be released and its telescope 138 then sighted forward late the manual knob 28 to translate the traveler block with its cross hairs aligned on the intersection of the 13 of the accessory \16 on the second transit (Gun #2) telescope and horizontal axle of the transit (Gun #1) at until the pillow apex 36 is brought to alignment with the temporary intervening station Y. The vertical angle of reference mark on the forward end 64 of the tape, as is and temperature at transit (Gun #2) at station X are also indicated at 163 in FIG. 7. In FIG. 7 both of the 45 then observed and recorded. Now transit (Gun #2) is reference marks “0” and “100” on opposite ends of the picked up and moved forward to station B which is as tape 37 are depicted by the common character “Z.” It surned to be (x ft.) less than one full chain length for will be noted from FIG. 6 that actually the second transit ward of temporary intervening station Y. With set up of (Gun #2) was set up over a point short of a complete the transit (Gun #2) at station B and exact alignment of chain length the short distance d. While this chaining 50 its plumb bob over the station B point, the traveler block is being accomplished the temperature of the air at the 39 of the accessory or attachment 10 mounted on this middle of the chain tape 37 can be observed by swinging transit (Gun #2) can then be adjusted by manipulation a thermometer there at the height of the tape. With the of the manual knob 28 to bring the pillow apex 36 back second transit (Gun #2.) remaining in its set up position to exact alignment with the axle axis of telescope 138. at temporary intervening station X, the next step in the 55 With telescope 138 sighted back on the intersection of measurement of the distance between stations A and B telescope 38 and the axle of the transit (Gun #1) at tem is then performed in the following manner. porary intervening station Y, the chain tape 37 will then be pulled over the chain pillows 34, 34 of the two attach The ?rst transit (Gun #1) at station A is then moved ments, and with the reference mark “0” on the back end forward beyond the second transit at temporary interven ing station X to approximately a chain length therefrom 60 62 of the chain tape aligned with the pillow apex 36 of the adjusted traveler block 30 on the transit (Gun #1) at at temporary intervening station Y and set up in the man station Y the exact measurement between it and the pillow ner described with respect to the second transit at station apex 36 aligned precisely over station B point will be X. The ?rst transit (Gun #1) at temporary intervening directly read from the tape. This will give the exact dis station Y is then sighted back upon the second transit (Gun #2), which remained without change at temporary 65 tance between stations A and B as two full chains, plus one chain minus (x ft.). intervening station X, in the same manner as was the It will thus be seen that no precise measuring of the ex sighting of the latter upon the ?rst transit when set up at act distances between station A and temporary intervening station A. With all clamps secure, the vertical angle and station X, and between the latter and temporary interven temperature at the transit (Gun #1) at temporary inter vening station Y are observed and recorded. Now the 70 ing station Y, was necessary to the determination of the exact distance between the stations A and B. The manipu distance is chained between the temporary intervening lations of the accessories or attachments 16, 10 mounted stations X and Y by using in the previously described on the two transits (Gun #1 and Gun #2) automatically manner the accessories or attachments 10, 10 of the two accommodated the differences between exact chain lengths transits. In this procedure, since the telescopes 38 and 138 of both of the transits (Gun #1 and Gun #2) are 75 and the true distances between the starting point and the 3,083,464 8 7 temporary intervening stations without requiring any book traveler having an apex transversely aligned with the telescope axle axis and the telescope optical axis for travel along the latter in substantially parallel relation thereto recording of any measured intervening distances. if it is required to get the plus distance to a point along the line during such chaining procedure, this can be accom when said screw means is rotated, the apex of said pillow plished easily by measuring the distance to the point from the index mark provided on the attachment by the pillow slidably rested thereon and held against longitudinal means being alignable with a reference mark on a chain apex. This measured distance is the hypotenuse of a right triangle with one leg thereof being the distance at the apex index mark from the center line of the telescope movement. 1 2. A chaining attachment or accessory mounted on a ‘ surveyor’s transit having a conventional telescope pivotal and with the other leg thereof being the required plus dis 10 ly supported on a transverse axle comprising, in combina tance which can be obtained by computation. The device of the present invention when mounted upon a transit and used in the manner proposed permits prac tice of a simple and direct Way of measuring a line and at the same time retaining a very high degree of accuracy. 15 said transit with said plate extending longitudinally along With the use of a pair of transits so equipped and the line measured in the manner indicated on the incline, due to one side of the optical axis of the telescope, an elongated translating screw supported by said arms for free rota di?erences in elevations of the set up points, the vertical angle is measured at each end of the chain tape length tion without longitudinal translation relative thereto, the tion with said transit; of an elongated frame plate hav ing a pair of support arms extending angularly therefrom and spaced longitudinally thereof, means ?xedly mounting said frame plate to an end of the axle of the telescope of axis of said screw being parallel to and to one side of thus affording a check on the angle. The horizontal com 20v the telescope optical axis with said frame plate mounted ponent of the tape length is the inclined distance multi ?xedly to the end of the telescope axle, hand grasp means plied by the cosine of the mean of the two vertical angles. carried by said screw for manual rotation thereof, a trav If the vertical component is needed it is the chain tape eler block having screw thread following means engaged length multiplied by the sine of the mean of the two with said screw, means to permit said block to slide along vertical angles. All measurements are taken at a con 25 said frame plate while preventing relative rotation for venient working height which is an important factor in causing said block to be translated along said screw paral performing ?eld work. The only critical requirement of lel to the telescope optical axis upon manual rotation of transits equipped with devices of the present invention is said screw, and an upwardly-tapered chain pillow carried - that the vertical circle and the bubble of each must be in by said block having a transversely-extending lateral precise adjustment. Advantageous use of the accessory or attachment of the present invention may be enhanced by a modified 30 apex over which a chain is to be stretched to alignment therewith of a reference mark on the chain, said pillow apex being located substantially in a lateral plane which form thereof, such as that illustrated in FIG. 8. As there includes as line elements the telescope axle axis and the in proposed, the accessory or attachment 110 may be like telescope optical axis for longitudinal translation along that illustrated in FIGS. 1 to 4 incl. except that the 35 the latter upon manual manipulation of said screw. frame plate 114 may have its outside vertical face 115 3. The chaining attachment as de?ned in claim 2 char provided with a measuring scale 65 having an “0” mark acterized by said frame plate having a longitudinally 66 at the position of the “0” mark 61 of the other em extending ?at face, said frame plate mounting means be bodiment, and with the pillow body 134 of the traveler ing of a construction to ?x said plate to the end of the block 130 modi?ed in shape so that the apex 136 is at the 40 telescope axle with said ?at face arranged in a vertical high part of a rounded nose 67. The latter feature avoids plane, said screw being rotatably mounted laterally to the the tendency of a chain tape to be sharply bent at the side of said ?at face for translation along the latter of pillow apex which may exist when the latter is the sharp said pillow apex, and an elongated measurement scale edge of a wedge-shaped body, such as 34 of the FIGS. 1 carried by said ?at face and oriented to be arranged sub to 4 incl. embodiment. 45 stantially parallel to the telescope optical axis with the It will thus be seen that the objects set forth above, pillow apex being translatable along said scale for direct among those made apparent from the preceding descrip reading of the distance of adjustment of the pillow apex tion, are e?iciently attained and, since certain changes along the telescope optical axis by screw manipulation. may be made in the above constructions without depart 4. A chaining attachment or accessory mounted on a ing from the scope of the invention, it is intended that all 50 surveyor’s transit having a conventional telescope pivotal matter contained in the above description or shown in the ly supported on a transverse axle comprising, in combina accompanying drawings shall be interpreted as illustrative tion with said transit; of an elongated ?at frame plate and not in a limiting sense. . having a longitudinally-extending, vertical outside face; It is also to be understood that the following claims a pair of longitudinally-spaced, substantially parallel arms are intended to cover all of the generic and speci?c fea 55 mounted on said frame plate and extending laterally out tures of the invention herein described, and all statements ward from the vertical face thereof; attaching means fix of the scope of the invention which, as a matter of lan edly mounting said frame plate to one end of the axle guage, might be said to fall therebetween. of said transit telescope with the outside face thereof ar Having described my invention, what I claim as new ranged substantially normal to the axle axis and extending and desire to secure by Letters Patent is: 60 longitudinally along one side and laterally of the optical l. A chaining attachment or accessory mounted on a axis of the telescope; a pair of aligned bemings with each surveyor’s transit having a conventional telescope pivotal supported by one of said arms; an elongated translating ly supported on a transverse axle comprising, in combina screw having a pair of axially-spaced journals rotatably tion with said transit, of elongated frame means, means supported by said pair of bearings and a threaded section ?xedly mounting said frame means upon the axle of the 65 intervening said journals, said screw being located paral telescope of said transit with said frame means extending lel to the telescope optical axis and laterally to one side longitudinally in the direction of the optical axis of the thereof with said frame plate mounted ?xedly to the end telescope, elongated translating screw means rotatably of the telescope axle; a hand knob mounted on said supported by said frame means with arrangement of the screw for manual rotation thereof; a traveler block thread axis of said screw means substantially parallel to the tele 70 ably engaged with the threaded section of said screw and scope optical axis, means manually to rotate said screw having a side face juxtaposed to the vertical face of said means, a traveler having thread following means engaged frame plate for slide therealong parallel to the telescope by said screw means for translation longitudinally of said frame means along a path substantially parallel to the telescope axis, and chain pillow means carried by said, optical axis upon manual rotation of said screw while preventing rotation of said traveler block; spring means interposed between said traveler block and one of said 3,083,464 10 arms preventing backlash between said block and the screw threaded section; and an upwardly-tapered chain pillow carried by said block having a transversely-extend ing lateral apex over which a chain tape is to be stretched to alignment therewith of a reference mark ‘on the chain, said pillow apex being arranged as a line element in a mounted on said translating means for travel therealong longitudinally of said frame means along a path substan tially parallel to the telescope axis, means to adjust the position of said traveler along said translating means, means temporarily to ?x said traveler in a selected one of a plurality of adjusted positions along said translating lateral plane parallel to and spaced the average thickness of conventionl chain tapes below a lateral plane which means with ?ne adjustment of the forward position of said traveler relative to a chaining point over which said transit is set up, and chain pillow means ?xedly carried includes as line elements the telescope axle axis and the telescope optical axis for longitudinal translation along 10 by said traveler having an apex transversely aligned with the telescope optical axis for travel along the latter in the telescope optical axis upon manual rotation of said screw. 5. The chaining attachment or accessory as defined in claim 4 characterized by an elongated measurement scale substantially parallel relation thereto when said traveler is adjusted along said translating means, the apex of said pillow means providing a reference point for alignment carried by said frame plate vertical face and oriented sub 15 therewith of a reference mark on a chain slidably rested thereon and pulled tautly thereover while being held stantially parallel to the telescope optical axis with the against longitudinal movement with respect to another pillow apex being translatable along said scale for direct reading of the distance of adjustment of the pillow apex remote chaining point. along the telescope optical axis by screw rotation. References Cited in the ?le of this patent 6. A chaining attachment or accessory mounted on a 20 surveyor’s transit having a conventional telescope pivot UNITED STATES PATENTS ally supported on a transverse axle comprising, in com bination with said transit, of elongated frame means, means ?xedly mounting said frame means upon the axle of the telescope of said transit with said frame means ex 25 tending longitudinally in the direction of the optical axis of the telescope, elongated translating means supported by said frame means with arrangement of the axis of said translating means substantially parallel to the telescope 380,740 437,308 2,706,336 Balsbaugh ___________ __ Apr. 10, 1888 Markham ____________ .._ Sept. 30, 1890 Gruber ______________ _._ Apr. 19, 1955 OTHER REFERENCES Tracy: Surveying Theory and Practice, New York, John Wiley & Sons, Inc., Fifth Printing, 1955, Fig. 716(b), optical axis and normal to the axis of said axle, a traveler 30 page 856 relied on.